We are having exactly the same problem as you are with the PS3 and a 46" Samsung tv - however if we play a game, it doesn't blink anymore.
Ever since I plugged in a HDMI cable from my PS3 to my Samsung TV, the TV blinks between a black screen and back to my PS3. It happens once in a while and it is very annoying to have my television just blink out and come back again.
My TV model is LNT4661FX/XAC
I am not a tech savvy person, and I was hoping if anyone has a solution to my problem.
Thanks in advance.